Ok, Im putting back echo cancellation, since there's no change at all in the fax receiving success rate.<br>I'd like to focus back to the original topic.<br><br>My incoming faxes end up usually as either timeout or hangup error:<br>
<br>timeout - is this supposed to happen in an E1 line? Can the timeout threshold be changed?<br><br>hangup - currently more frequently encountered. I noticed in the console that the remote channel hangup status 16 shows up in the middle of the fax session. According to sangoma, this is a normal hangup but asterisk fax detects this as error. I have already set it to use the e1 line clock source.<br>
<br><br>On Friday, July 27, 2012, Kevin P. Fleming <<a href="mailto:kpfleming@digium.com">kpfleming@digium.com</a>> wrote:<br>> On 07/27/2012 09:53 AM, Eric Wieling wrote:<br>><br>>> People seem to think that Asterisk won't disable the Echo Canceler when a fax tone is detected. Why they think that is a total mystery to me,.<br>
><br>> Asterisk doesn't do this, the echo canceller itself does (or DAHDI does, in some cases). With modern ECs, as well, they don't even get disabled when a CED tone (from the answering FAX endpoint) is heard, they instead just turn off their non-linear processors, because it's been found through years of experience that leaving 'most' of the EC still in place makes FAX calls more reliable than if it was completely disabled.<br>
><br>> Since the OP has a Sangoma card with an Octasic hardware echo canceller on it, he should just leave it alone and let it do its job :-) Turning it off is probably making things worse.<br>><br>> Sometimes I wish it was possible to selectively eradicate 'conventional wisdom' from the world!<br>
><br>> --<br>> Kevin P. Fleming<br>> Digium, Inc. | Director of Software Technologies<br>> Jabber: <a href="mailto:kfleming@digium.com">kfleming@digium.com</a> | SIP: <a href="mailto:kpfleming@digium.com">kpfleming@digium.com</a> | Skype: kpfleming<br>
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